package DAO;

import java.util.List;

public class ReaderImp implements ReaderDAO{
    @Override
    public List<String> checkBookrack(String username) {
        return null;
    }

    @Override
    public Boolean isVip(String username) {
        return null;
    }

    @Override
    public Double balance(String username) {
        return null;
    }
}
